Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 33 for “"line transect"”.
-
Line transect abundance estimation with uncertain detection on the trackline
After critically reviewing developments in line transect estimation theory to date, general likelihood functions are derived for the case in which detection probabilities are modelled as functions of any number of explanatory variables and detection of animals on the trackline (i.e. directly in the …
-
A non-linear spotlight line transect method for estimating white-tailed deer population densities
… density estimates obtained from spotlight strip transect surveys to regulate annual harvest Yet, density estimates from the standard spotlight strip transect method are known to be inaccurate in areas of dense vegetation, and alternatives such as the Hahn method, mark-recapture, or aerial strip …
-
A simulation study of the effect of target motion on sighting estimates of minke whale population density
Line transect methods used to estimate population density assume stationarity of targets. Violation of this assumption leads to overestimation of the true density. A simulation study based on a hazard-rate model is used to assess the resulting bias. The model is calibrated to generate sighting data …
-
Statistical methods for spatial screening
… process to model the UXO distribution. A line transect survey is used to collect data on one coordinate of individual object locations. Two-stage (global and local) sampling strategy is applied to screen the contaminated site. In the global sampling, the estimators of the cluster …
-
Comunidades recifais do Arquipélago dos Abrolhos, BA, com ênfase em corais (Cnidaria: Scleractinia e Milleporidae): aspectos metodológicos e comparações entre locais
… was performed using quadrats and intercept line transect methods. Colony size and inclination, the distances from random points to the nearest colony and between nearest colonies of the same species were evaluated for the five most frequent or abundant coral species (Agaricia agaricites, …
-
Effects of Water Table Depth and Edaphic Characteristics on Plant Diversity in a Southern Mississippi Pitcher Plant Bog
… and pressure fluctuations along a ~710-meter line transect traversing upland and bog habitats. Vegetation sampling quadrats (n=128) were set up near each piezometer. Cover data and water table depths were collected in spring and late summer. Soil samples collected from each treatment group …
-
Keanekaragaman jenis terumbu karang di Pantai Kondang Merak Kabupaten Malang
… pada lima stasiun dengan menggunakan metode line transect, kemudian pada masing–masing stasiun dibuat lima transek. Sampel diidentifikasi di laboratorium Ekologi Jurusan Biologi, Fakultas Sains dan Teknologi Universitas Islam Negeri Maulana Malik Ibrahim Malang. Hasil penelitian menunjukkan …
-
Vegetation Response After Invasive Tamarix Spp. Removal in the Riparian Zone and Semi-Arid Rangeland Ecosystems
… six different methodologies: Point intercept, line transect, nearest neighbor, meter-square quadrats, nested Whittaker plots, and densitometer with the objective of developing monitoring protocols that can be used by scientists and land managers alike. This project is in collaboration with …
-
Observation scale effects on fluid transport behavior of soil
… 19 subsites spaced logarithmically along a 150 m line transect in a Groseclose mapping unit near Blacksburg; Virginia. Three core sizes were taken at each subsite at the soil surface and 0.5 m depth. 'Small' cores were-40x54 mm; 'medium' cores were 60X100 mm; and 'large' cores were 100x150 mm. …
-
Wintering Reddish Egret (Egretta Rufescens) Foraging Response To Environmental Variability On The Southern Texas Gulf Coast
… foraging habitat requirements, I conducted line transect surveys via boat of foraging Reddish Egrets from November 2019 to March 2021 in the Laguna Madre land cut of the Gulf Intracoastal Waterway, an area with a large portion of tidal flat habitat. Using negative binomial and logistic …
-
Effects of exotic invasive vegetation on breeding birds along the North Chickamauga Creek
… season, bird communities were surveyed using the line transect census method at four sites along the North Chickamauga Creek in Hamilton County, Tennessee. Two of the sites were regarded as being highly invaded by exotic understory plant species, while the other two sites remain relatively free of …
-
Abundance, distribution, and threats of mammals and trees within the Lingadzi Namilomba Forest Reserve within Lilongwe, Malawi, and a conservation action plan for the protection of the Reserve
… action plan. This was to provide a baseline study that can be used by local authorities to monitor and manage the park rationally. A systematic line transect census was used to survey the mammals within the reserve, whilst belt transects and 10x10 quadrats were used to carry out a …
-
Chimpanzee conservation in light of impending iron ore mining project in SE Senegal
… of human disturbance using reconnaissance and line transect surveys. A total of 184 nests were recorded in and around the 256 km2 Kharakhena (KR) study site and 243 nests at the 64 km2 Bofeto (BO) site. Human disturbances including villages, cultivated areas, mining activities, and tree cutting …
-
Cabaceiras: uma análise dos aspectos físicos e do uso da terra como fatores agravantes da Desertificação.
… analysis of phytosociological dates through of transects in certain areas in advanced process of desertification. The aim of the paper has as general guiding principle is apply the survey methodology of vegetation and observe the relationship with the desertification process in the municipality …
-
Influência de parâmetros abióticos na estruturação da taxocenose suprabêntica de peixes em cinco áreas de costão rochoso em Arraial do Cabo, RJ
… at two different depths leveis, using the line transect technique. Nine parameters on the water quality were measured. The visual census per area and gathering of testimony specimens were used to record fishes and their abundance. The physiographyc factors were analyzed by clusterina and …
-
Population structure and recruitment patterns of the indigenous Mussel Perna perna and the Alien Mussel Mytilus galloprovincialis on the central coast of Namibia
… of 2 m one 10 x 10 cm quadrat was placed along a line transect from the spring low water level to the spring high water level. Everything was removed within the quadrat and stored at -20 °C. Thereafter, samples were sorted with two sets of sieves with mesh 2 mm and 0.5 mm into different size …
-
Understanding the interannual variability of pCO2 in the sea-ice impacted Southern Ocean
… Ocean, three ocean basins, and the Goodhope line transect. Averaged over the Southern Ocean, the range of year-to-year variability of pCO2 between 2000 to 2018 was between 290 atm (2004) and 355 atm (2003). It is also noted that the interannual variability in pCO2 does not correspond to that …
-
Natural and anthropogenic influences on elephants and other ungulates in the Congo forest
… by developing spatial models combined with line transect survey data in two forest sites in Central Africa. In the Odzala National Park in the Republic of Congo, I examine elephant dung abundance data in relation to human threats and protection. In the Okapi Faunal Reserve in the Democratic …
-
Structure of a primate community in Reserve Adolpho Ducke, central Amazonia
… primary rainforest bordering the city of Manaus. Line transect sampling was used to survey the primates with a total of 248km walked between February – May 2018. Nine transects were sampled resulting in 108 sightings of 5 different species including 16 Saguinus bicolor, 44 Sapajus apella, 14 …
-
Mule deer response to military activity in southeast Colorado
… Demographic data were compared to previous baseline data (1983-1984). Buck annual survival rates did not differ during 1983-1988; doe annual survival rates also were similar during this period. Summer fawn survival differed only between 1984 and 1987, being higher in 1987. All fawn mortalities …
Page 1 of 2